mailbox database.edb and a sum of totalitemsize output difference

Posted on 2011-09-06
Last Modified: 2013-11-05
My Exchange 2007 server  has mailbox database.edb   file, that is  137 GB in size
If I pull  the report by running a command " Get-MailboxStatistics -Database “Mailbox Database” | Select DisplayName,  TotalItemSize | Export-CSV.." , then summarize TotalItemSize for all mailboxes, I am getting   160 GB number.  Several days ago it was 172 GB, but after the users ran some cleanup the size reduced to 160 GB. The size ofa  mailbox database.edb file  still is growing though.

Could anybody help me to figure out why there is a difference between the  size of mailbox database.edb file and a sum of all TotalItemSize items.

Thank you
Question by:irinadruker
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
  • 2
LVL 23

Assisted Solution

by:Suliman Abu Kharroub
Suliman Abu Kharroub earned 250 total points
ID: 36493959

Author Comment

ID: 36500702
I would understand  if I have .edb file larger then total up all the mailboxes plus white space, but the situation is opposite, .edb file is 137 GB, total up all the mailbox is 160 GB plus white space   is about  1 GB.
LVL 23

Expert Comment

by:Suliman Abu Kharroub
ID: 36500992
it is strange.are you sure all of these mailboxes hosted in one database ?
Does Powershell have you tied up in knots?

Managing Active Directory does not always have to be complicated.  If you are spending more time trying instead of doing, then it's time to look at something else. For nearly 20 years, AD admins around the world have used one tool for day-to-day AD management: Hyena. Discover why


Author Comment

ID: 36506109
we have just one  database,  but we have a standby server  on the recovery site, with information store distmounted , replicated by a software  called ca xosoft, and I just wonder, if that might be something to do with this strange  issue
LVL 49

Accepted Solution

Akhater earned 250 total points
ID: 36506152
You can never compare edb size to toal size of mailboxes there is a lot of factors

Whitespace is one, the other is sis (single instance storage) where one attachement sent to multiple users will show in the size of each mbx but only one in tne db

Author Comment

ID: 36506203
is  it possible to confirm that is the case, I thought about it,  as our users are  sending multiple attachments to a number of people, but not sure how can I get the numbers
LVL 49

Expert Comment

ID: 36506235
What do you mean confirm? Again there is no direct relation between the edb and the mailbox sizes.

Typically the edb will be bigger because of retention items, white space, table structures etc...

However in a case where same mail is sent to multiple users then sis will result in an edb smaller than the total of the mailboxes

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article will help to fix the below error for MS Exchange server 2010 I. Out Of office not working II. Certificate error "name on the security certificate is invalid or does not match the name of the site" III. Make Internal URLs and External…
Check out this step-by-step guide for using the newly updated Experts Exchange mobile app—released on May 30.
In this video we show how to create a Shared Mailbox in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Recipients >> Sha…
This video demonstrates how to sync Microsoft Exchange Public Folders with smartphones using CodeTwo Exchange Sync and Exchange ActiveSync. To learn more about CodeTwo Exchange Sync and download the free trial, go to:…

696 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question